* Both Seadrill and Grieg rose sharply last week * Abroad European shares rose 0.12 pct, Japan’s main share index Nikkei ended down -0.18 pct, while in China Shanghai index was up 0.02 pct and Dow Jones index in the United States 1.21 pct on Monday (Reporting By Ole Petter Skonnord, editing by Terje Solsvik)